Moves maintaining root_window_for_new_windows_ to Shell

ash/root_window_controller.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_ROOT_WINDOW_CONTROLLER_H_
 #define ASH_ROOT_WINDOW_CONTROLLER_H_
 
 #include <map>
 #include <memory>
 #include <vector>
@@ skipping 301 matching lines @@
   // The initial color is determined by the |root_window_type| and whether or
   // not this is the first boot.
   void CreateSystemWallpaper(RootWindowType root_window_type);
 
   // Enables projection touch HUD.
   void EnableTouchHudProjection();
 
   // Disables projection touch HUD.
   void DisableTouchHudProjection();
 
-  // Resets WmShell::GetRootWindowForNewWindows() if appropriate. This is called
+  // Resets Shell::GetRootWindowForNewWindows() if appropriate. This is called
   // during shutdown to make sure GetRootWindowForNewWindows() isn't referencing
   // this.
   void ResetRootForNewWindowsIfNecessary();
 
   // Callback for MenuModelAdapter.
   void OnMenuClosed();
 
   // Overridden from ShellObserver.
   void OnLoginStateChanged(LoginStatus status) override;
   void OnTouchHudProjectionToggled(bool enabled) override;
@@ skipping 51 matching lines @@
 
 // On classic ash, returns the RootWindowController for the given |root_window|.
 // On mus ash, returns the RootWindowController for the primary display.
 // See RootWindowController class comment above.
 ASH_EXPORT RootWindowController* GetRootWindowController(
     const aura::Window* root_window);
 
 }  // namespace ash
 
 #endif  // ASH_ROOT_WINDOW_CONTROLLER_H_